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Difference between revisions of "cpp/string/wide/iswxdigit"

From cppreference.com
< cpp‎ | string‎ | wide
(+note on locale independence)
m (fmt.)
 
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{{cpp/title|iswxdigit}}
 
{{cpp/title|iswxdigit}}
 
{{cpp/string/wide/navbar}}
 
{{cpp/string/wide/navbar}}
−
{{ddcl | header=cwctype |
+
{{ddcl|header=cwctype|
 
int iswxdigit( wint_t ch );
 
int iswxdigit( wint_t ch );
 
}}
 
}}
Line 7: Line 7:
 
Checks if the given wide character corresponds (if narrowed) to a hexadecimal numeric character, i.e. one of {{tt|0123456789abcdefABCDEF}}.
 
Checks if the given wide character corresponds (if narrowed) to a hexadecimal numeric character, i.e. one of {{tt|0123456789abcdefABCDEF}}.
  
 +
{{cpp/string/wide/wint_t args}}
 
===Parameters===
 
===Parameters===
−
{{param list begin}}
+
{{par begin}}
−
{{param list item | ch | wide character}}
+
{{par|ch|wide character}}
−
{{param list end}}
+
{{par end}}
  
 
===Return value===
 
===Return value===
−
Non-zero value ({{c|true}}) if the wide character is a hexadecimal numeric character, {{tt|0}} ({{c|false}}) otherwise.
+
Non-zero value if the wide character is a hexadecimal numeric character, zero otherwise.
  
 
===Notes===
 
===Notes===
−
{{tt|iswdigit}} and {{tt|iswxdigit}} are the only standard wide character classification functions that are not affected by the currently installed C locale.
+
{{lc|std::iswdigit}} and {{tt|std::iswxdigit}} are the only standard wide character classification functions that are not affected by the currently installed C locale.
 +
 
 +
===Example===
 +
{{example
 +
|code=
 +
#include <cwctype>
 +
#include <iostream>
 +
 
 +
int main()
 +
{
 +
    std::cout << std::boolalpha
 +
              << (std::iswxdigit(L'a') != 0) << ' '
 +
              << (std::iswxdigit(L'ä') != 0) << '\n';
 +
}
 +
|output=
 +
true false
 +
}}
  
 
===See also===
 
===See also===
−
{{dcl list begin}}
+
{{dsc begin}}
−
{{dcl list template | cpp/locale/dcl list isxdigit}}
+
{{dsc inc|cpp/locale/dsc isxdigit}}
−
{{dcl list template | cpp/string/byte/dcl list isxdigit}}
+
{{dsc inc|cpp/string/byte/dsc isxdigit}}
−
{{dcl list see c | c/string/wide/iswxdigit}}
+
{{dsc see c|c/string/wide/iswxdigit}}
−
{{dcl list end}}
+
{{dsc end}}
 
{{cpp/string/character classes}}
 
{{cpp/string/character classes}}
 +
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 14:21, 30 May 2023

 
C++
 
Strings library
 
Null-terminated wide strings
 
Defined in header <cwctype>
int iswxdigit( wint_t ch );

Checks if the given wide character corresponds (if narrowed) to a hexadecimal numeric character, i.e. one of 0123456789abcdefABCDEF.

If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined.

Contents

[edit] Parameters

ch - wide character

[edit] Return value

Non-zero value if the wide character is a hexadecimal numeric character, zero otherwise.

[edit] Notes

std::iswdigit and std::iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale.

[edit] Example

Run this code
#include <cwctype>
#include <iostream>
 
int main()
{
    std::cout << std::boolalpha
              << (std::iswxdigit(L'a') != 0) << ' '
              << (std::iswxdigit(L'ä') != 0) << '\n';
}

Output: 

true false

[edit] See also

 checks if a character is classified as a hexadecimal digit by a locale
(function template) [edit]
checks if a character is a hexadecimal character
(function) [edit]
C documentation for iswxdigit
ASCII values characters

iscntrl
iswcntrl

isprint
iswprint

isspace
iswspace

isblank
iswblank

isgraph
iswgraph

ispunct
iswpunct

isalnum
iswalnum

isalpha
iswalpha

isupper
iswupper

islower
iswlower

isdigit
iswdigit

isxdigit
iswxdigit

decimal hexadecimal octal
0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) ≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 tab (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
14–31 \xE–\x1F \16–\37 control codes ≠0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 space 0 ≠0 ≠0 ≠0 0 0 0 0 0 0 0 0
33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
48–57 \x30–\x39 \60–\71 0123456789 0 ≠0 0 0 ≠0 0 ≠0 0 0 0 ≠0 ≠0
58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
65–70 \x41–\x46 \101–\106 ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0
71–90 \x47–\x5A \107–\132 GHIJKLMNOP
QRSTUVWXYZ 		0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0
91–96 \x5B–\x60 \133–\140 [\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
97–102 \x61–\x66 \141–\146 abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0
103–122 \x67–\x7A \147–\172 ghijklmnop
qrstuvwxyz 		0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
123–126 \x7B–\x7E \172–\176 {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
127 \x7F \177 backspace character (DEL) ≠0 0 0 0 0 0 0 0 0 0 0 0
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